How to get CPU, RAM and Network-Usage of a Java7 App

Question

I found this older article how-to-monitor-the-computers-cpu-memory-and-disk-usage-in-java and wated to ask, if there is something new in java 7. I want to get the current CPU

Answer 1

why cant you just use like bellow,

  try {
      for (String ni : sigar.getNetInterfaceList()) {         
        NetInterfaceStat netStat = sigar.getNetInterfaceStat(ni);   
        total+=netStat.getRxBytes();        
      }
    } catch (SigarException e) {
      e.printStackTrace();
    }

what is the difference???